Hi Jason,
If it's just the installation software then it should always be available on their website (the most recent version should be).
I had a similar problem with an Origin B2 GPS Camera locator I bought. Got it home and the Installation disc was toatally knackered - I mean REALLY knackered !! Totally currupt. Couldn't go back to the store as it was a Sunday and past closing time !! 'B*gger I thought'.... then went to Origins website, onto the downloads page, downloaded the latest installer software and Bob's ya Uncle problem solved !!
Have a look on the Navman site.....
Hope this helps
Cheers
The Ed